package com.gtc.zsk.service.impl;

import static com.gtc.zsk.constant.UserConstant.ADMIN_ROLE;
import static com.gtc.zsk.constant.UserConstant.USER_LOGIN_STATE;

import cn.dev33.satoken.stp.StpUtil;
import com.gtc.zsk.constant.UserConstant;
import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gtc.zsk.common.ErrorCode;
import com.gtc.zsk.constant.CommonConstant;
import com.gtc.zsk.constant.RedisConstant;
import com.gtc.zsk.exception.BusinessException;
import com.gtc.zsk.mapper.UserMapper;
import com.gtc.zsk.model.dto.user.UserQueryRequest;
import com.gtc.zsk.model.entity.User;
import com.gtc.zsk.model.enums.UserRoleEnum;
import com.gtc.zsk.model.vo.LoginUserVO;
import com.gtc.zsk.model.vo.UserVO;
import com.gtc.zsk.satoken.DeviceUtils;
import com.gtc.zsk.service.UserService;
import com.gtc.zsk.utils.SqlUtils;

import java.time.LocalDate;
import java.time.Year;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.List;
import java.util.stream.Collectors;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.bean.WxOAuth2UserInfo;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.redisson.api.RBitSet;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

/**
 * 用户服务实现
 *
 * @author <a href="https://github.com/ligtc">程序员鱼皮</a>
 * @from <a href="https://gtc.icu">编程导航知识星球</a>
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    /**
     * 盐值，混淆密码
     */
    public static final String SALT = "gtc";

    private static final String pattern = "[a-zA-Z0-9][a-zA-Z0-9_@]+";
    private static final String emailPattern = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$";
    private static final String phonePattern = "\\d{11}$";


    @Resource
    private RedissonClient redissonClient;

    @Resource
    private UserMapper userMapper;

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword, String userName) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4 || userAccount.length() > 20) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号不得少于4位或大于20位");
        }
        if (!userAccount.matches(pattern)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号必须由数字、字母、_或@自由组成, 且不能以特殊字符开头");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        // 密码和校验密码相同
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        if (StringUtils.isNotBlank(userName) && (userName.length() < 2 || userName.length() > 12))
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户昵称长度应为2至12个字符");
        synchronized (userAccount.intern()) {
            // 账户不能重复
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("userAccount", userAccount);
            long count = this.baseMapper.selectCount(queryWrapper);
            if (count > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
            }
            // 2. 加密
            String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
            // 3. 插入数据
            User user = new User();
            user.setUserAccount(userAccount);
            user.setUserPassword(encryptPassword);
            user.setUserName(userName);
            boolean saveResult = this.save(user);
            if (!saveResult) {
                throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
            }
            return user.getId();
        }
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if (StringUtils.isAnyBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短,不能小于4位");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短,不能少于8位字符");
        }
        // 2. 加密
        String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
        // 查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        // 用户不存在
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号不存在或密码错误");
        }
        if (user.getStatus().equals(1)) {
            throw new BusinessException(ErrorCode.FORBIDDEN_ERROR, "您的账号已被封禁，详情请微信联系管理员！");
        }
        // 3. 记录用户的登录态
                //request.getSession().setAttribute(USER_LOGIN_STATE, user);
        //使用sa-token存储登录状态 不同的设备对应不同的token
        StpUtil.login(user.getId(), DeviceUtils.getRequestDevice(request));
        StpUtil.getSession().set(USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    @Override
    public LoginUserVO userLoginByMpOpen(WxOAuth2UserInfo wxOAuth2UserInfo, HttpServletRequest request) {
        String unionId = wxOAuth2UserInfo.getUnionId();
        String mpOpenId = wxOAuth2UserInfo.getOpenid();
        // 单机锁
        synchronized (unionId.intern()) {
            // 查询用户是否已存在
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("unionId", unionId);
            User user = this.getOne(queryWrapper);
            // 被封号，禁止登录
            if (user != null && UserRoleEnum.BAN.getValue().equals(user.getUserRole())) {
                throw new BusinessException(ErrorCode.FORBIDDEN_ERROR, "该用户已被封，禁止登录");
            }
            // 用户不存在则创建
            if (user == null) {
                user = new User();
//                user.setUnionId(unionId);
//                user.setMpOpenId(mpOpenId);
                user.setUserAvatar(wxOAuth2UserInfo.getHeadImgUrl());
                user.setUserName(wxOAuth2UserInfo.getNickname());
                boolean result = this.save(user);
                if (!result) {
                    throw new BusinessException(ErrorCode.SYSTEM_ERROR, "登录失败");
                }
            }
            // 记录用户的登录态
            request.getSession().setAttribute(USER_LOGIN_STATE, user);
            return getLoginUserVO(user);
        }
    }

    /**
     * 获取当前登录用户
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
//        // 先判断是否已登录
//        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
//        User currentUser = (User) userObj;
//        if (currentUser == null || currentUser.getId() == null) {
//            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
//        }
//        // 从数据库查询（追求性能的话可以注释，直接走缓存）
//        long userId = currentUser.getId();
//        currentUser = this.getById(userId);
//        if (currentUser == null) {
//            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
//        }
//        if (currentUser.getStatus().equals(1))
//            throw new BusinessException(ErrorCode.FORBIDDEN_ERROR, "您的账号已被封禁，详情请微信联系管理员！");
//        return currentUser;

        Object loginUserId = StpUtil.getLoginIdDefaultNull();
        if (loginUserId == null)
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        User currentUser = this.getById((String) loginUserId);
        if (currentUser == null)
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        if (currentUser.getStatus().equals(1))
            throw new BusinessException(ErrorCode.FORBIDDEN_ERROR, "您的账号已被封禁，详情请微信联系管理员！");
        StpUtil.getSession().set(USER_LOGIN_STATE, currentUser);
        return currentUser;
    }

    /**
     * 获取当前登录用户（允许未登录）
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUserPermitNull(HttpServletRequest request) {
        // 先判断是否已登录
        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            return null;
        }
        // 从数据库查询（追求性能的话可以注释，直接走缓存）
        long userId = currentUser.getId();
        return this.getById(userId);
    }

    /**
     * 是否为管理员
     *
     * @param request
     * @return
     */
    @Override
    public boolean isAdmin(HttpServletRequest request) {
        StpUtil.checkLogin();
        Object userObj = StpUtil.getSession().get(USER_LOGIN_STATE);
        User user = (User) userObj;
        return isAdmin(user);
//        // 仅管理员可查询
//        Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
//        User user = (User) userObj;
//        return isAdmin(user);
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }

    /**
     * 用户注销
     *
     * @param request
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
//        if (request.getSession().getAttribute(USER_LOGIN_STATE) == null) {
//            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
//        }
//        // 移除登录态
//        request.getSession().removeAttribute(USER_LOGIN_STATE);
//        return true;

        //没登录的话 checkLogin方法会自己抛出异常
        StpUtil.checkLogin();
        //移除登录态（所有设备的登录态都移除）
        StpUtil.logout();
        return true;
    }

    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVO(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String unionId = userQueryRequest.getUnionId();
        String mpOpenId = userQueryRequest.getMpOpenId();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String userAccount = userQueryRequest.getUserAccount();
        Integer gender = userQueryRequest.getGender();
        Integer vipLevel = userQueryRequest.getVipLevel();
        String email = userQueryRequest.getEmail();
        String phoneNumber = userQueryRequest.getPhoneNumber();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(id != null, "id", id);
        queryWrapper.eq(StringUtils.isNotBlank(unionId), "unionId", unionId);
        queryWrapper.eq(StringUtils.isNotBlank(mpOpenId), "mpOpenId", mpOpenId);
        queryWrapper.like(StringUtils.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StringUtils.isNotBlank(email), "email", email);
        queryWrapper.like(StringUtils.isNotBlank(phoneNumber), "phoneNumber", phoneNumber);
        queryWrapper.eq(ObjectUtils.isNotEmpty(gender), "gender", gender);
        queryWrapper.eq(ObjectUtils.isNotEmpty(vipLevel), "vipLevel", vipLevel);
        queryWrapper.eq(StringUtils.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StringUtils.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.like(StringUtils.isNotBlank(userName), "userName", userName);
        queryWrapper.orderBy(SqlUtils.validSortField(sortField), sortOrder.equals(CommonConstant.SORT_ORDER_ASC),
                sortField);
        return queryWrapper;
    }

    @Override
    public void validUser(User user, boolean add) {
        if (user == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        String userAccount = user.getUserAccount();
        String userPassword = user.getUserPassword();
        String userName = user.getUserName();
        String userProfile = user.getUserProfile();
        String userRole = user.getUserRole();
        String email = user.getEmail();
        String expertiseDirection = user.getExpertiseDirection();
        String grade = user.getGrade();
        String phoneNumber = user.getPhoneNumber();
        String workExperience = user.getWorkExperience();

        // 创建时，所有参数必须非空
        if (add) {
            if (StringUtils.isAnyBlank(userAccount)) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号不能为空");
            }
        }

        if (StringUtils.isNotBlank(userName) && (userName.length() < 2 || userName.length() > 10))
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户昵称长度不得少于2或大于10");
        if (StringUtils.isNotBlank(userAccount) && (userAccount.length() < 4 || userAccount.length() > 20)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号不得少于4位或大于20位");
        }
        // 不能以特殊字符开头 只能包含数字、字母、_ 和 @
        if (StringUtils.isNotBlank(userAccount) && !userAccount.matches(pattern)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号必须由数字、字母、_或@自由组成, 且不能以特殊字符开头");
        }
        if (StringUtils.isNotBlank(email) && !email.matches(emailPattern)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "邮箱格式错误");
        }
        if (StringUtils.isNotBlank(phoneNumber) && !phoneNumber.matches(phonePattern)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请正确输入11位电话号码");
        }
        if (StringUtils.isNotBlank(userPassword) && userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码设置过短，长度至少为8位");
        }
        if (StringUtils.isNotBlank(userPassword)) {
            String encryptPassword = DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
            user.setUserPassword(encryptPassword);
        }
        if (StringUtils.isNotBlank(userProfile) && userProfile.length() > 100){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "个性签名过长，请重新设置");
        }
        if (StringUtils.isNotBlank(expertiseDirection) && expertiseDirection.length() > 50){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "擅长方向过长，请重新设置");
        }
        if (StringUtils.isNotBlank(grade) && grade.length() > 15){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "年级过长，请重新设置");
        }
        if (StringUtils.isNotBlank(workExperience) && workExperience.length() > 50){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "工作经验过长，请重新设置");
        }
        if (StringUtils.isNotBlank(userRole) && ADMIN_ROLE.equals(userRole)){
            user.setVipLevel(6);
        }
        // 账户不能重复
        if (StringUtils.isNotBlank(userAccount)) {
            QueryWrapper<User> qw = new QueryWrapper<>();
            qw.eq("userAccount", userAccount);
            long count = userMapper.selectCount(qw);
            if (count > 0) {
                throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复，请重新设置");
            }
        }
    }

    @Override
    public boolean addUserSignIn(long userId) {
        LocalDate date = LocalDate.now();
        String key = RedisConstant.getUserSignInRedisKey(date.getYear(), userId);
        RBitSet signInBitSet = redissonClient.getBitSet(key);
        // 获取当前日期是一年中的第几天，作为偏移量（从 1 开始计数）
        int offset = date.getDayOfYear();
        // 检查当天是否已经签到
        if (!signInBitSet.get(offset)) {
            // 如果当天还未签到，则设置
            return signInBitSet.set(offset, true);
        }
        // 当天已签到
        return true;
    }
    //优化思路：1.减少网络调用次数（缓存到内存中）  2.减少传输带宽（减少体积 给前端让浏览器自己算  通过客户端来减少服务端压力） 3.减少循环和计算（位运算特性）
    //没必要在后端组装好数据后给前端  可以让前端让用户浏览器自己的cpu和内存算  这样就大大减少了传输的带宽和后端cpu占用
    @Override
    public List<Integer> getUserSignInRecord(long userId, Integer year) {
        if (year == null) {
            LocalDate date = LocalDate.now();
            year = date.getYear();
        }
        String key = RedisConstant.getUserSignInRedisKey(year, userId);
        RBitSet signInBitSet = redissonClient.getBitSet(key);
        // 加载 BitSet 到内存中，避免后续读取时发送多次请求
        BitSet bitSet = signInBitSet.asBitSet();
        // 统计签到的日期
        List<Integer> dayList = new ArrayList<>();
        // 从索引 0 开始查找下一个被设置为 1 的位  位运算做了查找的优化  不用像传统的for循环那样一个一个遍历寻找
        int index = bitSet.nextSetBit(0);
        while (index >= 0) {
            dayList.add(index);
            // 查找下一个被设置为 1 的位
            index = bitSet.nextSetBit(index + 1);
        }
        return dayList;
    }



}
